Unit for heat treating container preforms with double walls radiating in a staggered configuration

Abstract

Unit for treating blanks of hollow bodies made of plastic material, including an enclosure having two opposite walls, namely a first wall and a second wall facing the first one, which together define an enclosure through which the blanks pass along a predetermined longitudinal trajectory. Each wall includes a series of spaced emitters each having a plurality of sources of monochromatic or pseudo-monochromatic electromagnetic radiation sources; a reflective section extends into each space between two adjacent emitters; the emitters of the second wall are offset longitudinally with respect to those of the first wall, so that the emitters of each wall face a reflective section of the opposite wall.

1 . Unit for treating blanks of hollow bodies made of plastic material, comprising an enclosure having two opposite walls, namely a first wall and a second wall facing the first one, which together define an enclosure through which the blanks pass along a predetermined longitudinal trajectory, wherein:
 each wall includes a series of spaced emitters, each comprising a plurality of sources of monochromatic or pseudo-monochromatic electromagnetic radiation sources;   a reflective section extends into each space between two adjacent emitters;   the emitters of the second wall are offset longitudinally with respect to those of the first wall, so that the emitters of each wall face a reflective section of the opposite wall.   
     
     
         2 . Treatment unit according to  claim 1 , characterized in that it comprises means of driving blanks in at least two parallel lines inside the enclosure. 
     
     
         3 . Treatment unit according to  claim 2 , characterized in that it comprises means of driving blanks in two staggered parallel lines. 
     
     
         4 . Treatment unit according to  claim 1 , characterized in that each emitter has a width substantially equal to or greater than that of the reflective section facing it. 
     
     
         5 . Treatment unit according to  claim 1 , characterized in that each wall comprises a juxtaposition of individual modules, each of which comprises:
 a matrix emitter,   a slotted reflector framing the emitter.   
     
     
         6 . Treatment unit according to  claim 5 , characterized in that, for a given interval between two adjacent emitters, the emitters of the second wall are offset with respect to those of the first wall by a half-interval increased or decreased by a half-width of reflector. 
     
     
         7 . Treatment unit according to  claim 1 , characterized in that, for a given interval between two adjacent emitters, the emitters of the second wall are offset with respect to the first wall by a half-interval. 
     
     
         8 . Treatment unit according to  claim 1 , characterized in that the sources of radiation are lasers, for example VCSEL type laser diodes.